flac.h

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/* license:BSD-3-Clause
 * copyright-holders:Aaron Giles
 ***************************************************************************

    flac.h

    FLAC compression wrappers

***************************************************************************/

#pragma once

#ifndef __FLAC_H__
#define __FLAC_H__

#include <stdint.h>
#include "libchdr_zlib.h"
#include "FLAC/ordinals.h"
#include "FLAC/stream_decoder.h"

/***************************************************************************
 *  TYPE DEFINITIONS
 ***************************************************************************
 */

typedef struct _flac_decoder flac_decoder;
struct _flac_decoder {
        /* output state */
    FLAC__StreamDecoder*    decoder;                /* actual encoder */
    uint32_t                sample_rate;            /* decoded sample rate */
    uint8_t                 channels;               /* decoded number of channels */
    uint8_t                 bits_per_sample;        /* decoded bits per sample */
    uint32_t                compressed_offset;      /* current offset in compressed data */
    const FLAC__byte *      compressed_start;       /* start of compressed data */
    uint32_t                compressed_length;      /* length of compressed data */
    const FLAC__byte *      compressed2_start;      /* start of compressed data */
    uint32_t                compressed2_length;     /* length of compressed data */
    int16_t *               uncompressed_start[8];  /* pointer to start of uncompressed data (up to 8 streams) */
    uint32_t                uncompressed_offset;    /* current position in uncompressed data */
    uint32_t                uncompressed_length;    /* length of uncompressed data */
    int                     uncompressed_swap;      /* swap uncompressed sample data */
    uint8_t                 custom_header[0x2a];    /* custom header */
};

/* ======================> flac_decoder */

void        flac_decoder_init(flac_decoder* decoder);
void        flac_decoder_free(flac_decoder* decoder);
int         flac_decoder_reset(flac_decoder* decoder, uint32_t sample_rate, uint8_t num_channels, uint32_t block_size, const void *buffer, uint32_t length);
int         flac_decoder_decode_interleaved(flac_decoder* decoder, int16_t *samples, uint32_t num_samples, int swap_endian);
uint32_t    flac_decoder_finish(flac_decoder* decoder);

/* codec-private data for the CDFL codec */
typedef struct _cdfl_codec_data cdfl_codec_data;
struct _cdfl_codec_data {
    /* internal state */
    int     swap_endian;
    flac_decoder    decoder;
#ifdef WANT_SUBCODE
    zlib_codec_data     subcode_decompressor;
#endif
    uint8_t*    buffer;
};

/* cdfl compression codec */
chd_error cdfl_codec_init(void* codec, uint32_t hunkbytes);
void cdfl_codec_free(void* codec);
chd_error cdfl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen);

#endif /* __FLAC_H__ */